Arrangement of vibrating apparatus for sound signaling



Feb. 17, 1925. 1,526,414

A. DU BOlS-REYMOND ARRANGEMENT OF VIBRATING APPARATUS FOR SOUND SIGNALING Filea'Uan 5, 1921 m9 45m in PaemedFeb. 17 1925.1

' UNITED-STATES PATENT "oi-'-r--ica,

. ALARD no nors-nnmorinbr rLoN, GERMANY, assrenon ro SIGNAL ensrmnsenar'r ur. .11., or .KIEL, GERMANY. 1

aanauemmnn'r or vmm'rme arranarus roa scum) smuamue.

Application med January 5, 1921. -sena1] n5-.-4a5,29e.

To a?! whom it may concern i i Be it known that I, ALARD- DU BOIS- REYMOND, citizen of the German Republic,

and residing at Plon, county of Schleswig- "in England on June 8, 1920, Patent No.

144,664; Italy on June 19, 1920, Patent No; 530/201: in Holland on July 26, 1919, Patent No. 9,132; in Argentina on May 20, 1921, Patent No. 20,432), of which the following is a specification.

-Elec,tromagnetically actuated vibrating apparatus which act as sound transmitters or receivers are known in which two or more parts are made to' execute mutual. oscillations by some agency such as alternating electric currents or sound waves, andin which one of the said parts is attached to, or consists of, a diaphragm, or a-wall acting as a diaphragm, that abuts-against the sound propagating medium, while the other part or parts are attached to something else and so adjusted as to be at a'certain distance from the part that is fixed to the diaphragm, or' from the diaphragm itself. With this arrangement it is easy to fix the said distance "for certain definiteconditions of operation, but in all cases in which the diaphragm'becomes bent, as-for example when thediaphragm is subjected suflicient static pressure, the .said distance is changed. a

" sThe chan'geableu'ess of the distance between the parts becomes a matter of special importance in cases where the electromag netle sound producer or receiver, in whichmasses of iron or current-conductors are set in motion, is to housed at different depths under water. The diaphragm isbent inwards, under the' influence of the external -water pressure applied to it and hence-the air-gap between the armature and the mag- .net, orbetween, the oscillating currentconductlng parts, 18 changed.

The object of "this invention is to prevent i this change ofthe distance betwecu the mutually oscillating parts. plished by attaching the 'parts of sound producers or receivers of this kindwhic h, for the proper working of the instrument, should always be the'same distance apart-'- directly or indirectly to the diaphragm itself in such a manner that, they are all displaced by the effect of the static pressure to the same extent and in the same direction. The connecting members by which This is accomthe parts are joined together or which join' a part to the diaphragm must then be of a kind, or if elastic of asize, that permits of an oscillating'movement of the parts toward and away from each other. The in- Vention is carried into effect either by at- 'tachin separate parts of the apparatus to difi erent parts of the diaphragm that executemotions equal in magnitude and direction, or by first assembling the parts of the oscillating apparatus so as to form a complete oscillator, which is then advantageously fixed to a single point of the diaphragm, or to a plate or surface which is attached'to, or forms apart of, the diaphragm, the plate or surface being either rigid in itself or-made unbending by stifi'en ing members;

.The arrangement is then of a kind in which the elastic members that connect the mutually oscillating parts serve to hold them at. a certain normal distance from each other, which distance is not varied when the diaphragm .is bent by static pressure.

A way of carrying out-the invention is shown in the drawing in which anelectromagnetically actuated sound producer haw ing' a 'special armature attached to a diaphramg'is diagrammatically illustrated.

l-is the skin or hull of a vessel or-the like,

2 a diaphragm abutting against the water,

3 the armature of, an.elec t-ro-magnet, 4 the 'electromagnet, 5 elastic connecting members betweenfthe armature andthe electroma poslte phase of the armature and the electro-magnet, 6 magnetizing coils for the electromagnet, and 7 a rotectlve casing.

et which permit of oscillations in op It'is evident that in'the described design,

the distance across the gap between the active iron masses 3 and 4 of the electromagnetic system is maintained by the elastic connecting members a'), 5 and is'q'uite independent -of the extent to which the-diaphragm 2 might be bent by using the sound producer at diiferent depths of water. It will be obvious that the position of the parts may be reversed from that shown, so that the armature 3 is freely vibratable while the electromagnet is attached directly to the diaphragm.

I claim:

In elect-ro-magnetic submarine communication 1 apparatus,

sound abutting against the water and subject to its static pressure, and an electro-magnetic system carried v by said diaphragm; said a diaphragm electro-magnetic system comprising an electro magnet, an armature, and elastic connecting means holding the electro-magthe electro-magnet and the armature is not varied when the diaphragm is. bent by said static pressure. .r

In testimony whereof I afiix my signature in presence of two witnesses.

ALARD DU BOIS-REYMOND.

Witnesses LEONID ADELMAnN, BRUNO Mi'mnnn. 

